Have a look at:
String.fromCharCode(64)
and
String.prototype.charCodeAt(0)
The first must be called on the String class (literally String.fromCharCode...) and will return “@” (for 64). The second should be run on a String instance or primitive (e.g., "@@@".charCodeAt...) and returns the Unicode code of the first character (the ‘0’ is a position within the string, you can get the codes for other characters in the string by changing that to another number).
The script snippet:
document.write("Unicode for character ਔ is: " + "ਔ".charCodeAt(0) + "<br />");
document.write("Character 2580 is " + String.fromCharCode(2580) + "<br />");
gives:
Unicode for character ਔ is: 2580 Character 2580 is ਔ